Radio Broadcast (May-Oct 1925)

Record Details:

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Do Weather Conditions Influence Radio? 9i THE IMPORTANCE OF LOW AND HIGH PRESSURE AREAS CYCLONES and anti-cyclones pass across the country approximately every three to four days, varying in frequency with the season of the year. They always occur alternately. Two high pressure areas (anticyclones) or two low pressure areas (cyclones) never succeed each other. "Lows" and "Highs," as they are named on the weather map, always alternate. Meteorologists have studied the variety of weather associated with these pressure centers, and through the agency of the United States Weather Bureau, the forecasting of the passing weather has attained a fair degree of accuracy. In general, it may be said, that cloudy, rainy, or snowy weather and moderate to high temperatures are the accompaniment of Lows, while clear and cool to very cold weather accompanies Highs. There are exceptions to both of these assertions, but they are not many. Now, a striking feature of these pressure areas lies in the variation of their respective intensities as revealed by the arrangement of their Isobars. An isobar is a line which passes through all points having the same atmospheric pressure, i.e., through all points where the barometer reads the same. The isobars tend toward a concentric arrangement. In an ideal pressure center they would be absolutely concentric. Irregularities in their course may be due to many reasons, such as temperature differences, variations in moisture content of the air, topography, and so on. DO WEATHER CONDITIONS INFLUENCE RADIO RECEPTION? TT OCCURRED to the writer when he * heard statements referring to the weather and radio reception, such as are quoted at the beginning of this discussion, that their logic was frequently faulty. It seemed that with broadcasting and receiving stations oftentimes 500 to 1000 miles apart, the local weather conditions at the receiving station could not have much influence on reception, unless the same conditions prevailed over all the country between the two stations. Such uniformity in weather is not common. Therefore, to ascribe poor receptivity to the local weather could not be an accurate analysis. Furthermore, it was true that occasionally A TYPICAL WEATHER MAP OF THE UNITED STATES Which shows clearly the alternating "Highs" and "Lows." According to the theory advanced by the author, radio reception in a low pressure area tends to be somewhat weaker than in a high pressure zone of corresponding intensity